Junior Science Light Quiz

1. Which one will REFLECT ALL the light that hits it?

A mirror

The sun

Stars

A red dress

A red dress can only reflect red light; the mirror can reflect any wavelength shone onto it.

Explanation

A red dress can only reflect red light; the mirror can reflect any wavelength shone onto it.

2. Which is the definition of light?

The movement of air particles hitting your eardrum

A force that all objects with mass have

A type of energy (electromagnetic) that we can detect with our retina

What all matter is made up of

Light is defined as a type of energy (electromagnetic) that we can detect with our retina. This definition accurately describes light as a form of energy that is visible to us through our sense of sight. Light is a fundamental part of the electromagnetic spectrum and is characterized by its ability to travel in waves and particles called photons. When light enters our eyes, it stimulates the cells in our retina, allowing us to perceive it as different colors and brightness levels.

Explanation

Light is defined as a type of energy (electromagnetic) that we can detect with our retina. This definition accurately describes light as a form of energy that is visible to us through our sense of sight. Light is a fundamental part of the electromagnetic spectrum and is characterized by its ability to travel in waves and particles called photons. When light enters our eyes, it stimulates the cells in our retina, allowing us to perceive it as different colors and brightness levels.

3. The colours of the rainbow are red, orange, yellow, green, blue, ___________ and violet.

The given question asks for the missing color in the sequence of colors of the rainbow. The correct answer is "indigo". The colors of the rainbow, in order, are red, orange, yellow, green, blue, indigo, and violet.

Explanation

The given question asks for the missing color in the sequence of colors of the rainbow. The correct answer is "indigo". The colors of the rainbow, in order, are red, orange, yellow, green, blue, indigo, and violet.

Submit

4. Humans can see all wavelengths of light

True

False

NO: visible light is a very small part of the electromagnetic spectrum (possible wavelengths)

Explanation

NO: visible light is a very small part of the electromagnetic spectrum (possible wavelengths)

5. Match the following

light rays

colours

ROY G BIV

photons

Submit

6. What colour will a BLUE dress look under RED light?

White

Black

Red

Blue

Only red light is hitting the object: this is all absorbed by a blue dress.

Explanation

Only red light is hitting the object: this is all absorbed by a blue dress.

7. Which is TRUE?

Light with a shorter wavelength has MORE energy than longer wavelengths

Light with a shorter wavelength has LESS energy than longer wavelengths

Because it takes more energy for the photon to move up and down more often (shorter wavelength/greater frequency)

Explanation

Because it takes more energy for the photon to move up and down more often (shorter wavelength/greater frequency)

8. Which one describes WAVELENGTH?

The distance a light ray travels each second

The distance between the crest of a wave and the trough (lowest point)

The distance between Earth and the sun

The distance between two crests right next to each other in a wave

The correct answer is "the distance between two crests right next to each other in a wave." This is because wavelength refers to the distance between two consecutive crests or troughs in a wave. It is a measure of the spatial extent of one complete cycle of a wave and is commonly represented by the symbol λ (lambda).

Explanation

The correct answer is "the distance between two crests right next to each other in a wave." This is because wavelength refers to the distance between two consecutive crests or troughs in a wave. It is a measure of the spatial extent of one complete cycle of a wave and is commonly represented by the symbol λ (lambda).